I love it. It has that unique U4E feel thatI so enjoy, which is part chaos (which I also enjoy). If this is any indication of where U4E is going on UT2K3, then I have high hopes that it will equal, if not surpass (given time), the UT1 version.
Now I have a suggestion, prehaps allow the primary bubbles to be able to push the bubble-entrapped victim, pushing them say, over a steep area or death chasm to damage/kill them. I also though of allowing the primary bubbles to prolongue the life of the trap bullble, but after reading what Max said, I don't think that would be very logical, unless he finds a way to fit it in, according to his will.
I'd be ready to lend a hand, but not right now (full time anyway). I'm on my pet project right now, and looking for work. When either one will be in satisfactory state, I'll be ready to dedicate more time for you guys in sound/weapons/voicepacks/whatnot. I still have the sounds for U4ET I submitted so if you want them or some new/modified sounds contact me with no worries. I could also give you some of my stuff if interested.
Again, great job on the bubble gun. Love the bubbles. Keep it up!